Improved excavator



`UN1TED STATES PATENT OFFICE@ JASON (l. OSGOOD, OF TROY, NEW YORK.

IM PROVED EXCAVATO R.

Specification forming part of Letters Patent No. 48,58] dated July 4, 1865.

4 tor 5 and I do hereby declare that the following is a full and exact description of said improvement, reference being had to the accompan ying drawings, and to the letters of reference marked thereonmaking a part of4 this specification, in which- Figure 1 is a side view of the crane, dipperhandle,dipper, (including saidimprovements,)

and tackle for raising and lowering the dipper.

Fig. 2 is a view of the top of the crane, including` said improved portions. Fig. 3 is atranst verse section of the friction-wheels and shaft,

ceed to describe the construction and opera-` tion of said improvement, referring more particularly to said improvement as an improvement on the excavator known as the Garmichaei and OsgoodWexcavator.

The mode of transferring power from the engine to the crane-gearing is not described here, because the same does not differ materially from the ordinary modes. The construction of the crane and its operations is not described, only so far as the said improvement is applicable thereto, because the crane does not ditfer from many excavator-cranes now in use, except i the changes made by said improvement, hereinafter described.

I make the forward sheave-wheel, A, on the endof the crane atoothed wheel, so constructed that the teeth will tit the links of the chain, andthus preventthechain from slipping on the wheel. ThenIconstructtheshaftofthissheavewheel so that the same will project through and beyond the outside of the crane, and on the outer end key a small toothed chain-wheel, B, which I connect by a chain or belt, K, with a larger toothed concave friction-wheel C. I

then construct the dipper-handle shaft D, to which is attached the pinions E, on which they dipper-handle L runs, of sufficient length to project through and beyond the outside of the crane and through the concave friction-wheel C. On this shaft, and inside of the concave iriction wheel O, Iconstruct a convex frictionwheel, F. The toothed concave friction-'wheel C is so constructed as to run loose onA the shaft D when not in use. On the end oi' shaft D, I place a lever, H, the short arm of which runs in a groove cut ou the outer side of the concave friction-wheel C, by means of which lever the inner faceof the concave friction-wheel G is forced against the outer face of the convex friction-wheel F, causing the shaft D and pinions E to revolve, and thus forcing the dipperhandle outward as the dipper is being forced into and through the material to be excavated. By this meansa larger space can be excavated without moving the machine, and the dlipper can also be made to [ill in shallow cutting.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination of the toothed chain friction-wheel C with the friction-wheel F, the belt, chain, and toothed Wheel B,and toothed sheave` wheel A, for the purposes as herein set forth.

JASON C. OSGOOD. 

